\\[-1.8ex] Soil Heterogeneity & $-$0.245 & $-$0.238 & $-$0.350$^{*}$ & $-$0.300 \\ 
  & (0.172) & (0.167) & (0.193) & (0.186) \\ 
\\[-1.8ex]
Dependent Variable Mean & 0.00 & 0.00 & 0.00 & 0.00 \\ 
Dependent Variable SD & 1.00 & 1.00 & 1.00 & 1.00 \\ 
Observations & 21,671 & 21,721 & 21,686 & 21,730 \\ 
R$^{2}$ & 0.607 & 0.643 & 0.567 & 0.602 \\ 
